Printer s clamp



Patented Jan. 5, 1926.

UNITED TES 1,568,745 PATEN YFFCE.

JOHN KYLE, OIE*` PHILADELPHIA, PENNSYLVANIA.

PRINTERS CLAMP.

Application filed September a quick and expeditious manner and with great facility and accuracy.

With the above ends in view, vmy invention consists of a printers hook or clamp composed of a suitable slide block, an upper clamping plate extending at an angle of forty-tive degrees to the slide block and having a suitable jaw edge; said slide being adapted to enter the dove-tailed grooves or channels in said base, from the top of said grooves or channels, and having suitable transverse recesses for the reception of pivotally mounted expansion clamping leaves, whereby, said slide may be fixed at any point with respect to the dove-tailed channel.

My invention further consists of a pair of opposed clamping expansion leaves, pivotally mounted at their upper ends, in the upper portion of said recesses in said slide, upon substantially parallel pivot pins, `a spread or wedge block interposed between said twoclamping leaves and an operating screw extending through said outer clainping plate, having its head rotatably mounts ed therein, and having its stem extending through said wedge block and thrcadedly engaging the same, 'whereby said wedge block may be raised or lowered at will by the rotation of said operating screw, therebyto force said pivotally mounted clamping leaves outwardly into operative engagement with the walls ofY said dove-tailed channels, or to release the same 'from such engagement. l

For the purpose of illustrating my invention, l. have shown in theV accompanying drawings forms thereof which are at present preferred by me since they will give in practice satisfactory and reliable result-s, .although it is to be understood that the various instrumentalit-ies of which my invention consists can be variously arranged and 28, 1925. ,Serial No. 58,997.

organized and that my invention is not limited to the precise arrangement and organization of these instrumentalities as herein shown and described.

Referring to the drawings Figure 1 represents a plan view of a portion of the base for a printing press having secured'thereto a` printing plate, by means of the novel printers hooks or clamps of my invention. y l

Figure 2 represents a plan view of my novel printers hook or clamp onv a slightly enlarged scale.

Figure 8 represents an end elevation of my novel device.

Figure L represents a bottom plan view of my novel device.

Figure 5 represents a section on line 5-5 of Figure 2, on a greatly enlarged scale, showing the operative parts of my novel device.

Referring to the drawings, in which like reference characters indicate like parts, l designates a small portion of the base for a printing press, having therein a series of parallel dove-tailed channels or grooves 2,

extending at an angle of forty-five degrees to the boundaries of said base, which grooves are adapted to receive fastening devices by means of which the printing plate 3 is secured to said platen or cylinder.

The clamping device or printers hooks or clamps 4, of my novel construction, consist of a slide block, of substantially rectangu` lar-cross-section, andof a width substantially -thesame as the upper width of said dove-tailed channels 2, yso that said slide block may be inserted into said channels from the top; said slide block 5 having formed integral therewith an outer or upper clamping plate 6, extending at an angle of forty-tive degrees thereto, so that said slide, when seated within any one of said channels 2, will maintain said clamp plate 6, at an angle of forty-five degrees to said channels, in whatever position said plate may be.' One of the longitudinal edges 7 of said clamping plate 6, is bevelled inwardly atan. angle of forty-live degrees, thereby to provide a suitable jaw,- to engage the correspondingly bevelled edges 8 of the printing plate 3.

The slide block 5 is kprovided with a transverse recess 9, having pivotally mounted therein the` tapered expansion clamping leaves l0 and ll respectively, by ineansrof the pivot pins 12 and 13, passing longitudinally through said slide block and through the upper ends of said leaves.

The operating screw 14, having its head 15 rotatably seated within a corresponding opening 16 in said clamping plate 6, with the lower edge of said head abutting the shoulder 17 in said opening, passes through and threadedly engages, a wedge 18, which is operatively interposed between said two pivotally mounted leaves 10 and 11, in such a manner as to force said leaves apart when it is raised by said screw. The head 15 of the operating screw 111 is further provided with a rectangular axial opening 20 in the top thereof, adapted to receive a square shank of a suitable key, wrench or handle, (not shown in the drawings) whereby said operating screw may be revolved.

Thus, to apply my novel clamps 4, it is merely necessary to lower the wedge block 1.8. by revolving the screw 11, so as to permit said clamping leaves 10 and11 to be brought inwardly` and then to insert the slide block 5, of my novel clamp, carrying with it the pivotally mounted leaves 10 and 11 and the wedge block 18, into any one of the dove-tailed channels Q. Thereafter, the clamp it is moved up into position, with the bevelled jaw 7 thereof in engagement with the corresponding bevelled edge 8 of t1 e printing plate 3, and the screw 14, with the aid of a suitable square shank key, (not shown in the drawings) is revolved so as to raise said wedge block 18, thereby to force said leaves 10 and 11 outwardly7 into operative engagement with the inclined walls of said dovetailed channel 2, thereby fixing and securing said device in position and drawing the clamp plate 6 thereof tightly against the upper surface 19 of said base 1. The clamp 4 may then be adjusted in the usual manner, either by loosening the screw 15 and moving the clamp a` slight distance, or by tapping the clamp lightli with a suitable tool. My novel printers hook or clamp, possesses many advantages over similar devices known and used hereto fore, and it is adapted to be used in connection with a standard base for printing presses. Thus, whereas, in similar devices used heretofore, it required considerable skill to insert or dropv a clamp into the channel through the top thereof, due to the inwardly enlarged cross-section thereof; my novel clamp may be inserted into tne channel directly through the top thereof with ease by merely closing the leaves l() and 11. Furthermore, dueto the pivotal mounting of the clamping leaves 10 and 11. said clamping leaves not only fix and secureI the slide block 5 at any point within the dove tailed channels 2, but also serve to draw downwardly the slide block 5 and hence to draw the upper clampv plate tightly against the upper surface of the base.

It will now be apparent that I have devised a novel and useful construct-ion of printers hook or clamp which embodies the fea-tures of advantage enumerated as desir-able in the statement of the invention and the above description, and while I have in the present instance shown and described a preferred embodiment thereof which will givein practice satisfactory results, it is to be understood that such embodiment `is susceptible of modification in various particulars without departing from the spirit or scope of the invention or sacrificing any of .its advantages.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. ln a printers clamp of the character stated, a slide block, a transverse recess in said slide block, a clamping leaf pivoted in said recess, near the upper part thereof and parallel to the longitudinal edges of said slide block` a wedge block adapted to en gage said clamping leaf thereby to force the same outwardly about said pivot, and an operating screw threadedly engaging said wedge block, thereby to raise and lower the same so as to bring said wedge block into operative engagement with `said clamping leaf, and to remove the same from such operative engagement.

2. VIn a printers clamp of the character stated, a slide block, a ,transverse recess in said slide block, a. clamping leaf pivoted in said recess, near the upper part thereof and parallel to the longitudinal edges of said slide block, a wedge block adapted to engage said clamping leaf thereby to force the saine outwardly about said pivot, an operating screw threadedly engaging said wedge block. thereby to raise and lower the same so as to bring said wedge block into operative engagement with said clamping leaf, and to remove the same from such operative engagement and an outer, upper clamping plate carried by said slide block, having a suitable jaw along an edge thereof.

il. .In a printers clamp of the character stated. a slide block, a transverse recess in said slideblock, a pair of opposed clamping leaves pivoted 'in said recess, near the upper part thereof and parallel to the longitudinal. edges of said slide'block, a wedge block operatively interposed between said clan'iping leaves-thereby to force the same outwardly about said pivot, and an operating screw threadedlv engaging said wedge block, thereby to raise and lower the same so as to bring said wedge block into operative engagement with said clamping leaves, and to remove the same from such operative engagement.

In a printer-s clamp of the character stated, a slide block, a transverse recess in said slide block, a pair of opposed clamping leaves -pivoted in said recess, near the upper part thereof and parallel to the longitudinal edges of said slide block, a wedge block operatively interposed between said clamping leaves thereby to force the same outwardly yabout said pivot, an operating screw threadedly engaging said wedge block, thereby to raise and lower the saine so as tobriug said wedge blockinto operative engagement with said clamping leaves, and to remove the same from such operative engagement, and an outer, upper' clamping plate carried by said slide block, having a suitable jaw along an edge thereof.

5. In a printers clamp of the character stated., a slide block, a transverse recess in said slide block, a clamping leaf pivoted in said recess, near the upper part thereof and parallel to the longitudinal edges of said slide block, a wedge block adapted to engage said clamping leaf thereby to force the same outwardly about said pivot, an operating screw threadedly engaging said wedge block thereby to raise and lower the same so as to bring said wedge block into operative engagement with said clamping leaf, and to remove the same from such operative engagement and an outer, upper clamping plate carried by said slide block, at an angle of forty tive degrees to the longitudinal edges thereof, said clamping plate having an inwardly bevelled clamping jaw along a longitudinal edge thereof.

In a printers clamp of the character stated, a slide block, a transverse recess in said slide block, a pair of opposed clamping leaves pivoted in said recess, near the upper part thereof and parallel to the longitudinal edges of said slide block, a wedge block operatively interposed between said clamping leaves thereby to force the same outwardly about said pivot, and an operating screw threadedly engaging said wedge block, thereby to raise and lower the same so as to bring said wedge block into operative engagement with said clamping leaves, and to remove the same from such operative en gageinent and an outer, upper clamping plate carried by said slide block, at an angle ofvforty tive degrees to the longitudiual edges thereof, said clamping plate having an inwardly bevelled clamping jaw along a longitudinal edge thereof.

7. In a printers clamp of the character stated, a slide block, a transverse recess in said slide block, a clamping leaf pivoted in said recess near the upper part thereof, and parallel to the longitudinal edges of said slide block, a wedge block adapted to actuate said leaf, an outer, upper clamping plate carried by the said slide block, having an inwardly bevelled clamping jaw along an edge thereof, an operating screw extending through said clamping plate into said recess and having its head journalled within said plate; said operating screw threadedly engaging said wedge block thereby to raise and lower the same when said screw is revolved and thus to actuate said clamping leaf and a suitable openingin the top of said head of said screw for receiving a suitable operating handle.

' 8. In a printers clalnp'of the character stated, a'slide block, a transverse recess in said slide block, a pair of clamping leaves pivoted in said recess near the upper part thereof and parallel to the longitudinal edges ofsaid slide block, a wedge block operatively interposed between said clamping leaves, an outer, upper clamping plate carried by the said slide block, having an inwardly bevelled clamping jaw along an edge thereof, an operating screw extending through said clamping plate into said recess and having its head journalled within said plate; said operating screw threadedly engaging said wedge block thereby to raise and lower the same when said screw is revolved and thus to actuate said clamping leaves and a suitable opening in the top of said head of said screw for receiving a suitable operating handle.

9. ln a printers clamp of the character stated, a slide block, a transverse recess in said slide block, a pair of opposed clamping leaves inovably mounted in said recess, a wedge block operatively interposed between said clamping leaves adapted to force the saine apart when said wedge block is drawn therebetween, an operating screw threadedly engaging said wedge block thereby to raise and lower the same, thereby to open and close, respectively, said clamping leaves.

l0. In a printers clamp of the character stated, a slide block, a transverse recess in said slide block, a pair of opposed clamping leaves yieldably mounted in said -recess adapted to move transversely of said slide block, a wedge block operatively interposed between said clamping leavesadapted to force the same apart when said wedge block is drawn therebetween, an operating screw threadedly engaging said wedge block, adapted thereby to raise and lower the saine` and an outer, upper clamping plate carried by said slide block, having a suitable jaw along an edge thereof.

ll. In a printers clamp of thecharacter stated, a slide block, a transverse recess in said slide block, a pair of opposed clamping leaves yieldably mounted in said recess adapted to move transversely of said slide block, a wedge block operatively interposed between said clamping leaves adapted to force the saine apart when said wedge block is drawn therebetween, an operating screw threadedly engaging said wedge block, adapted thereby to raise and lower the same,

and an outer, upper clamping,l plate carried by said slide bleek, at angle of forty tive degrees to the longitudinal edges thereof, said clamping plate having an inwardly bevelled Clamping jaw along a longitudinal edge thereof.

1Q. In a printers elanip of the Character stated, a slide block, a transverse recess extending through said slide block, a pair ot' clamping leaves in said recess, having their upper ends in fixed relation to each other and having their lower ends movable transversely of said slide block, a wedge bloei: operativi-ily interposed between said pair of clamping leaves, an outer, upper clamping plate carried by said slide block, at an angle of forty tive degrees thereto, and having an inwardly bevelled clamping jaw along an edge thereof7 an operating screw extending through said clamping plate into said recess and having its head journalled Within said plate; said operating screw threadedly engaging said wedge block, adapted to raise and lower the same, thereby to open and close said clamping leaves and a lsuitable opening in the top of' said head of said operating screw, for receivingl a suitable operating handle.

JOHN KYLE. 

